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Test form, passage position, and item position effects were investigated.
The right side of each Wright map displays item measures and item position.
We first correlated item RTF with item position in each block.
The regression coefficients for item position effects ranged from −.009 to −.037.
Figure 8 shows the item RTF, arranged by item position in each block.
Similar to the HYBRID, PD onset can occur after any item position throughout the test.
One can also study whether RTF correlates with item position and content area.
The person's individual switching point (δ p ) equals the last item position before decline onset.
The estimated regression coefficients for the form, passage, and item position effects were evaluated.
The results indicated that 23 out of the 45 items showed significant item position effects.
The simulation study showed that the SEM approach is quite accurate in detecting linear item position effects, except for the conditions in which both the number of examinees and the magnitude of the item position effect are small.
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